Insulator-pin.



PATENTED JAN. 10, 1905.

M. M. WOOD.

INSULATOR PIN.

APPLICATION FILED AUG. 8, 1903.

Witnesses:

Inventor;

M. Wood.

Moncravii l headed bolt6 is then inserted into the lower end I of the tube to, or nearly to, the shoulder"2.- By suitable dies three or more portions of the forming internal lugs 'Z .just below the-bolt-head 8, so that the bolt The lower end of the bolt extends below theend of the tube, so that cannot drop out.

UNITED STATES Patented January 10, 1Q05.

PATE T OFFIQE.

GENERAL ELECTRIC COMPANY, A CORPORATION OF NEWYORK.

msuLA'roR-Pm.

SPECIFICATION forming par of Letters Patent No. 779,828, dated January 10, 1905.

Application filed August 8, 1903. Serial N 0. 168,789. I

To all whom, it may concern: V

Be it known that I, MoN'rRAvILLE M. WooD, a citizen of the United States, residing at Schenectady. in the county of Schenectady and State of New York, have invented certain new and useful Improvements in Insulator-Pins, of which the following is a specification.

This invention relates to pins for supporting insulators for electric conductors; and its object is to provide a strong, light, and durable pin easily attached to a cross-arm or other support. My improved pin is made from a seamless steel tube, having ashoulder upset upon it to rest on the cross-arm, threads rolled in its upper end on a taper, and a fastening-bolt inserted intov its lower end and secured by inwardly-pressed portions of the tube under the bolt-head.

In the accompanying drawings, Figure 1 shows the blank from which my improved insulator-pin is made. Fig. 2 "shows the first step in manufacture; Fig. 3, the second step. Fig. 4 shows the final step. Fig. 5 is an elevation of the complete pin; and Fig. 6 is a cross-section onthe line 6 6, Fig. 4:. I

The blank 1 is apiece of metal tubing, preferably seamless steel, of suitable length and diameter, Fig. 1. The first step is to upset it at a point near the middle, so as to form a circumferential head or shoulder 2, Fig; 2. The next step is to insert amandrel 3, having a tapering screw-threaded end 4. By means of suitable rolls the blank is swaged down into contact with the mandrel, sothat theupper end of the tube becomes tapering and screwthreaded.

or more longitudinal slits 5 are" cut in the tube, running down from the upper end. A

tube are pressed in,

' The pin is light in weight,

down and is extremely durable.

, The mandrel is then removed by unscrewing it, as indicated in Fig. 3, and one when the pin is inserted in a hole in a crossarm 9 or the like the bolt will project through the hole and can receive a washer 10 and nuts 11. When the nuts are tightened, the bolthead bearing on the lugs 7 forces the shoulder 2 firmly-down upon the cross-arm and fastens the pin securely in place. It will be seen that the shank of the pin below the shoulder may be of some uniform length sulficient to give the pin stability"and need not necessarily be long enoughto pass through the cross-arm.

but has great latso that. it can resistheavy side It can be easily put up and'taken It can be manufactured at a comparatively .low cost and with the usual machine-tools, requiring no special appliances beyond the upsetting and pressing dies and the screw-threading mandrel and rolls.

In accordance with the patent statutes I have described the principle of my invention, together with the form which I now consider to represent the best embodiment thereof; but I desire to have it understood that the form shown is only illustrative and that the invention can be carried out by other means.

What I claim as new, and desire to secure by Letters Patent of the United States, is 1. An insulator-pin comprising a seamless steel tube having a tapering screw-threaded upper end, an integral upset shoulder and inwardly-pressed internal lugs, and a bolt having ahead'engaging with said lugs and extending below the lower end of said tube.

2. An insulator-pin comprising a metal tube externally-screw-threaded eral strength, strains.

having a "tapering upper end, an integral shoulder and internal lugs, a shank depending below said shoulder, and a headed bolt engaging with'said lugs. Y

In witness whereof I. have hereunto set my hand this 6th day of August, 1903.

, Witnesses:

- ALEX. F. MACDONALD,

HELEN ORFORD.

MONTRAYILLE M. WOOD; 

